A title-case filter for AngularJs

title-case-filter.js

// Came from the comments here:  https://gist.github.com/maruf-nc/5625869
app.filter('titlecase', function() {
    return function (input) {
        var smallWords = /^(a|an|and|as|at|but|by|en|for|if|in|nor|of|on|or|per|the|to|vs?\.?|via)$/i;

        input = input.toLowerCase();
        return input.replace(/[A-Za-z0-9\u00C0-\u00FF]+[^\s-]*/g, function(match, index, title) {
            if (index > 0 && index + match.length !== title.length &&
                match.search(smallWords) > -1 && title.charAt(index - 2) !== ":" &&
                (title.charAt(index + match.length) !== '-' || title.charAt(index - 1) === '-') &&
                title.charAt(index - 1).search(/[^\s-]/) < 0) {
                return match.toLowerCase();
            }

            if (match.substr(1).search(/[A-Z]|\../) > -1) {
                return match;
            }

            return match.charAt(0).toUpperCase() + match.substr(1);
        });
    }
});

^^:smile: problem with coffescript right there (didn't know anyone used it anymore TBH)

Thank you very much.

May I suggest adding a check for if input is undefined?

if(input === undefined){ return null; }

Works like a charm.